Hi,
I'm using an Apache <---> 3 Tomcats loadbalancing scenario with
Apache 1.3.26 mod_jk 1.2.0
3 x tomcat 4.0.4
The tomcats are configured with:
Xmx: 512m
AJP13 Connector allows for 800 connections
Each worker is set up like this and added to an loadbalanced worker
worker.host1.port=8009
worker.host1.host=host1
worker.host1.type=ajp13
worker.host1.lbfactor=10
worker.host1.socket_timeout=300
I keep experiencing the following problems:
-The threadcount of each tomcat process keeps increasing (never decreases)
- The memory usage keeps also increasing
- When examinig the tomcat process with "ps -aux" I see many(>200) threads
older than 1 day.
I thought that teh socket_timeout would always stop such threads after
5 minutes
The AJP-Connectior threads keep throwing exceptions like:
2002-12-09 16:58:59 Ajp13Processor[8009][583] process: invoke
java.net.SocketException: Socket closed
at java.net.SocketOutputStream.socketWrite0(Native Method)
at
java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:92)
at java.net.SocketOutputStream.write(SocketOutputStream.java:126)
at org.apache.ajp.Ajp13.send(Ajp13.java:525)
at org.apache.ajp.RequestHandler.finish(RequestHandler.java:495)
at org.apache.ajp.Ajp13.finish(Ajp13.java:395)
at
org.apache.ajp.tomcat4.Ajp13Response.finishResponse(Ajp13Response.java:196)
at
org.apache.ajp.tomcat4.Ajp13Processor.process(Ajp13Processor.java:464)
at
org.apache.ajp.tomcat4.Ajp13Processor.run(Ajp13Processor.java:551)
at java.lang.Thread.run(Thread.java:536)
2002-12-09 13:09:21 Ajp13Processor[8009][349] process: invoke
java.lang.IllegalArgumentException: Cookie name path is a reserved token
at javax.servlet.http.Cookie.<init>(Cookie.java:185)
at
org.apache.ajp.tomcat4.Ajp13Request.addCookies(Ajp13Request.java:189)
at
org.apache.ajp.tomcat4.Ajp13Request.setAjpRequest(Ajp13Request.java:148)
at
org.apache.ajp.tomcat4.Ajp13Processor.process(Ajp13Processor.java:446)
at
org.apache.ajp.tomcat4.Ajp13Processor.run(Ajp13Processor.java:551)
at java.lang.Thread.run(Thread.java:536)
- When a tomcat instance gets into problems some connections still seem to
work while others emit:
2002-12-09 13:32:25 Ajp13Processor[8009][155] process: invoke
java.lang.OutOfMemoryError
problem is that the mod_jk module (in the apache server) sometimes doesn't
notive that a tomcat instance has problems and keeps sending connectuions to
this particular instance , thereby freezing the whole cluster.
----------
Now my question is:
Do you think that upgrading to some other version of tomcat, mod_jk, apache
...... would solve some of my problems. Any experience with tomcat
load-balancing under high -loads (Currently ~1 million pageviews/day).
Any help would be appreciated?
llap,
julian l�ffelhardt
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